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Electrical Interfaces
5.7.5 TERMINAL (J5)
The Terminal Port (J5) pinouts are listed below in Table 5-20.
Table 5-20. RS-232 Terminal Port – 9-Pin Female "D" Connector (J5)
Pin Number
2
TxD
3
RxD
5
GND
5.7.6 ALARM (J6)
The modem has two Form-C Dry Contact Alarm Relays onboard and an Alarm Connector located
on the rear panel, the 9-pin male "D" sub connector (J6).
The two relays are designated Modulator Alarm and Demodulator Alarm. Non-Alarm is defined as
the powered state of the relay. Thus, if there is a Modulator Alarm and/or Demodulator Alarm, the
pins will be connected as shown in Table 5-21:
Pins 2 and 3 Shorted
Modulator
Pins 8 and 9 Shorted
Demodulator
The pin definitions for J6 are shown in Table 5-22 below.
Note: The NC and NO (Normally Closed and Normally Open) nomenclature applies to non-
energized relays.
Table 5-22. Alarm Connector Pin Assignment (J6)
J6 Pin
Number
1
Mod Alarm Relay A NO on Alarm
2
Mod Alarm Relay A Common
3
Mod Alarm Relay A NC on Alarm
4
5
AGC Voltage Output
6
GND
7
Demod Alarm Relay B NO on Alarm
8
Demod Alarm Relay B Common
9
Demod Alarm Relay B NC on Alarm
5-24
DMD2401/DMD2401L/DMD2401 IBS/IDR Satellite Modem
Signal
Transmit Data
Receive Data
Ground
Table 5-21. Alarm Relays
Alarm
Pins 1 and 2 Shorted
Pin 7 and 8 Shorted
Connection
Description
No Alarm
Direction
Input
Output
–
TM065 – Rev. 3.3
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